1. Division of Oral Microbiology, School of Dentistry, University of the Witwatersrand, Private Bag X6, Wits 2050, Johannesburg, South Africa
2. Department of Microbiology, Immunology and Parasitology, Louisiana State University Medical Center, New Orleans, LA, USA
3. Department of Morphology, Stomatology and Physiology, Ribeirão Preto School of Dentistry, University of São Paulo, Brazil
4. Department of Oral and Maxillofacial Surgery, Tokyo, Japan; and
5. Oral Biosciences, Faculty of Dentistry, University of Hong Kong